Gamma-Ray Emission from the Shell of Supernova Remnant W44 Revealed by the Fermi LAT

Details Gamma-Ray Emission from the Shell of Supernova Remnant W44 Revealed by the Fermi LAT Gamma-Ray Emission from the Shell of Supernova Remnant W44 Revealed by the Fermi LAT

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sci...327.1103a&link_type=abstract

Science, Volume 327, Issue 5969, pp. 1103- (2010).

Physics

62

Scientific paper

Recent observations of supernova remnants (SNRs) hint that they accelerate cosmic rays to energies close to ~1015 electron volts. However, the nature of the particles that produce the emission remains ambiguous. We report observations of SNR W44 with the Fermi Large Area Telescope at energies between 2 × 108 electron volts and 3 ×1011 electron volts. The detection of a source with a morphology corresponding to the SNR shell implies that the emission is produced by particles accelerated there. The gamma-ray spectrum is well modeled with emission from protons and nuclei. Its steepening above ~109 electron volts provides a probe with which to study how particle acceleration responds to environmental effects such as shock propagation in dense clouds and how accelerated particles are released into interstellar space.

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